I am using version 2019.1.215 and I am unable to import anything to fix the missing ScatterSeries classes.
SeriesGroup scatterSeriesGroup = chart.Chart.SeriesGroups.First() as ScatterSeriesGroup;ScatterSeries scatterSeries = scatterSeriesGroup.Series.First() as ScatterSeries; scatterSeries.Marker = new Marker(); scatterSeries.Marker.Symbol = MarkerStyle.Plus; scatterSeries.Marker.Size = 22; scatterSeries.Outline.Fill = new SolidFill(Colors.Red);